Effect of diatomite additive on the mechanical and dielectric properties of porous SiO2-Si3N4 composite ceramics

Guanglei You; Jianqiang Bi; Yafei Chen; Chonglong Yin; Chang’an Wang

doi:10.1007/s11595-016-1404-x

Effect of diatomite additive on the mechanical and dielectric properties of porous SiO₂-Si₃N₄ composite ceramics

Guanglei You, Jianqiang Bi^*, Yafei Chen, Chonglong Yin, Chang’an Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Porous SiO₂-Si₃N₄ composite ceramics with high porosity and excellent mechanical properties were fabricated by pressureless-sintering at relatively low temperature of 1 500 °C using diatomite as pore forming agent. The effects of diatomite on flexural strength, fracture toughness, shrinkage, porosity and phase transformation of the porous ceramics were investigated in detail. Compared with that of the ceramic without adding diatomite, the porosity of the ceramic with 10% diatomite is increased by about 27.4%, the flexural strength and fracture toughness reaches 78.04 MPa and 1.25 MPa·m^1/2, respectively. As the porosity increases, the dielectric constant of porous SiO₂-Si₃N₄ ceramic decreases obviously from 3.65 to 2.95.

Original language	English
Pages (from-to)	528-532
Number of pages	5
Journal	Journal Wuhan University of Technology, Materials Science Edition
Volume	31
Issue number	3
DOIs	https://doi.org/10.1007/s11595-016-1404-x
State	Published - 1 Jun 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.

Keywords

diatomite
dielectric constant
mechanical property
porosity
silicon nitride

ASJC Scopus subject areas

General Materials Science

Access to Document

10.1007/s11595-016-1404-x

Cite this

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title = "Effect of diatomite additive on the mechanical and dielectric properties of porous SiO2-Si3N4 composite ceramics",

abstract = "Porous SiO2-Si3N4 composite ceramics with high porosity and excellent mechanical properties were fabricated by pressureless-sintering at relatively low temperature of 1 500 °C using diatomite as pore forming agent. The effects of diatomite on flexural strength, fracture toughness, shrinkage, porosity and phase transformation of the porous ceramics were investigated in detail. Compared with that of the ceramic without adding diatomite, the porosity of the ceramic with 10\% diatomite is increased by about 27.4\%, the flexural strength and fracture toughness reaches 78.04 MPa and 1.25 MPa·m1/2, respectively. As the porosity increases, the dielectric constant of porous SiO2-Si3N4 ceramic decreases obviously from 3.65 to 2.95.",

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T1 - Effect of diatomite additive on the mechanical and dielectric properties of porous SiO2-Si3N4 composite ceramics

AU - You, Guanglei

AU - Bi, Jianqiang

AU - Chen, Yafei

AU - Yin, Chonglong

AU - Wang, Chang’an

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Porous SiO2-Si3N4 composite ceramics with high porosity and excellent mechanical properties were fabricated by pressureless-sintering at relatively low temperature of 1 500 °C using diatomite as pore forming agent. The effects of diatomite on flexural strength, fracture toughness, shrinkage, porosity and phase transformation of the porous ceramics were investigated in detail. Compared with that of the ceramic without adding diatomite, the porosity of the ceramic with 10% diatomite is increased by about 27.4%, the flexural strength and fracture toughness reaches 78.04 MPa and 1.25 MPa·m1/2, respectively. As the porosity increases, the dielectric constant of porous SiO2-Si3N4 ceramic decreases obviously from 3.65 to 2.95.

AB - Porous SiO2-Si3N4 composite ceramics with high porosity and excellent mechanical properties were fabricated by pressureless-sintering at relatively low temperature of 1 500 °C using diatomite as pore forming agent. The effects of diatomite on flexural strength, fracture toughness, shrinkage, porosity and phase transformation of the porous ceramics were investigated in detail. Compared with that of the ceramic without adding diatomite, the porosity of the ceramic with 10% diatomite is increased by about 27.4%, the flexural strength and fracture toughness reaches 78.04 MPa and 1.25 MPa·m1/2, respectively. As the porosity increases, the dielectric constant of porous SiO2-Si3N4 ceramic decreases obviously from 3.65 to 2.95.

KW - diatomite

KW - dielectric constant

KW - mechanical property

KW - porosity

KW - silicon nitride

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